Investigation and Validation of SRTM v3 and ALOS PALSAR Accuracy Over Landcover/Landuse Types in Federal Capital Territory (FCT), Nigeria

International Journal of Geoinformatics and Geological Science

© 2020 by SSRG - IJGGS Journal

Volume 7 Issue 3

Year of Publication : 2020

Authors : Olla, Charity Michael; Igbokwe, Joel Izuchukwu; Ojiako, Johnbosco Chibueze; Igbokwe, Esomchukwu Chinagorom

10.14445/23939206/IJGGS-V7I3P104

How to Cite?

Olla, Charity Michael; Igbokwe, Joel Izuchukwu; Ojiako, Johnbosco Chibueze; Igbokwe, Esomchukwu Chinagorom, "Investigation and Validation of SRTM v3 and ALOS PALSAR Accuracy Over Landcover/Landuse Types in Federal Capital Territory (FCT), Nigeria," SSRG International Journal of Geoinformatics and Geological Science, vol. 7,  no. 3, pp. 31-37, 2020. Crossref, https://doi.org/10.14445/23939206/IJGGS-V7I3P104

Abstract:

Digital elevation model (DEM) accuracy and spatial resolution are typically considered before a given DEM is used to assess any application. This is because the consequence of using unsuitable DEMs in environmental designs has a considerable and far-reaching effect on the resultant model. Hence this paper aimed to investigate and validate the accuracy of Shuttle Radar Topographic Mission (SRTMV3) and ALOS PALSAR DEM over Landcover/Landuse Types in Federal Capital Territory (FCT), Nigeria. The methodology involved data acquisition of ALOS PALSAR, SRTMV3, and Reference DEM, after which the ALOS PALSAR and SRTMV3 DEMs were resampled to 10m of the Reference DEM, image classification, and then an assessment of the impact of landcover/land-use types on DEM performance with horizontal profiles was carried out. The results revealed that Under landcover influence, SRTM performed better than ALOS PALSAR compared to the comparison with Reference DEM. The results indicated that the ALOS PALSAR overestimated the elevation under the influence of the built-up area, Vegetation, waterbody, and open space in the study area. It was recommended that SRTMV3 can be used as an alternative where high-resolution elevation data are not readily available for developmental activities in Abuja FCT, Nigeria.

Keywords:

Landcover/Landuse, Digital Elevation Model, SRTM, ALOS PALSAR, Image Classification

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